This AT-09 HM10 / HM-10 4.0 BLE Bluetooth Serial CC2540 CC2541 Module For IOS 6/Android 4.3 contains a BLE chip (a CC2540/CC2541). This AT-09 HM-10 Bluetooth Module allows performing serial communication with the BLE chip thanks to an Rx and a Tx pin. This 4.0 Bluetooth Serial Module is also very similar to the HM-10 module and is also compatible with it. So if you have some experience with the latter, you will get started quickly with the AT-09.